RESUMO
Two new diterpene rhamnosides, mimosasides B and C (1, 2) were isolated together with mimosaside A (3), a known diterpene rhamnoside (4), four known flavones (5-8), five known flavanones (9-13), and four known chalcones (14-17) from the leaves and twigs of a Brazilian medicinal plant, Mimosa hostilis.
Assuntos
Diterpenos/química , Mimosa/química , Ramnose/análogos & derivados , Estrutura Molecular , Ramnose/químicaRESUMO
Purification of polar fractions from cacao liquor extracts gave 17 phenolics including four new compounds. The new compounds were characterized as a C-glycosidic flavan, an O-glycoside of a dimeric and two O-glycosides of trimeric A-linked proanthocyanidins, on the basis of spectroscopic data. Isolated polyphenols showed inhibitory effects on nicotinamide adenine dinucleotide phosphate-dependent lipid peroxidation in microsomes and on the autoxidation of linoleic acid. These effects were attributed to the radical-scavenging activity in the peroxidation chain reactions, based on the findings that the cacao polyphenols effectively scavenged the 1,1-diphenyl-2-picrylhydrazyl radical.
